Pseudo-Random Number Generator

void sqlite3_randomness(int N, void *P);

SQLite contains a high-quality pseudo-random number generator (PRNG) used to
select random ROWIDs when inserting new records into a table that
already uses the largest possible ROWID. The PRNG is also used for
the build-in random() and randomblob() SQL functions. This interface allows
applications to access the same PRNG for other purposes.

R-37127-14782:[A call to this routine stores N bytes of randomness into buffer P.]R-44028-31666:[The P parameter can be a NULL pointer.]

R-30493-01537:[If this routine has not been previously called or if the previous
call had N less than one or a NULL pointer for P, then the PRNG is
seeded using randomness obtained from the xRandomness method of
the default sqlite3_vfs object.]R-28765-22796:[If the previous call to this routine had an N of 1 or more and a
non-NULL P then the pseudo-randomness is generated
internally and without recourse to the sqlite3_vfs xRandomness
method.]